Add alternate server address to QuicConfig.

net/quic/quic_config.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_QUIC_CONFIG_H_
 #define NET_QUIC_QUIC_CONFIG_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 197 matching lines @@
                                  HelloType hello_type,
                                  std::string* error_details) override;
 
  private:
   QuicTagVector send_values_;
   bool has_send_values_;
   QuicTagVector receive_values_;
   bool has_receive_values_;
 };
 
+// Stores IPEndPoint from CHLO or SHLO messages that are not negotiated.
+class QuicFixedIPEndPoint : public QuicConfigValue {
+ public:
+  QuicFixedIPEndPoint(QuicTag tag, QuicConfigPresence presence);
+  ~QuicFixedIPEndPoint() override;
+
+  bool HasSendValue() const;
+
+  const IPEndPoint& GetSendValue() const;
+
+  void SetSendValue(const IPEndPoint& value);
+
+  bool HasReceivedValue() const;
+
+  const IPEndPoint& GetReceivedValue() const;
+
+  void SetReceivedValue(const IPEndPoint& value);
+
+  void ToHandshakeMessage(CryptoHandshakeMessage* out) const override;
+
+  QuicErrorCode ProcessPeerHello(const CryptoHandshakeMessage& peer_hello,
+                                 HelloType hello_type,
+                                 std::string* error_details) override;
+
+ private:
+  IPEndPoint send_value_;
+  bool has_send_value_;
+  IPEndPoint receive_value_;
+  bool has_receive_value_;
+};
+
 // QuicConfig contains non-crypto configuration options that are negotiated in
 // the crypto handshake.
 class NET_EXPORT_PRIVATE QuicConfig {
  public:
   QuicConfig();
   QuicConfig(const QuicConfig& other);
   ~QuicConfig();
 
   void SetConnectionOptionsToSend(const QuicTagVector& connection_options);
 
@@ skipping 104 matching lines @@
   uint32_t ReceivedSocketReceiveBuffer() const;
 
   void SetMultipathEnabled(bool multipath_enabled);
 
   bool MultipathEnabled() const;
 
   void SetDisableConnectionMigration();
 
   bool DisableConnectionMigration() const;
 
+  void SetAlternateServerAddressToSend(
+      const IPEndPoint& alternate_server_address);
+
+  bool HasReceivedAlternateServerAddress() const;
+
+  const IPEndPoint& ReceivedAlternateServerAddress() const;
+
   bool negotiated() const;
 
   // ToHandshakeMessage serialises the settings in this object as a series of
   // tags /value pairs and adds them to |out|.
   void ToHandshakeMessage(CryptoHandshakeMessage* out) const;
 
   // Calls ProcessPeerHello on each negotiable parameter. On failure returns
   // the corresponding QuicErrorCode and sets detailed error in |error_details|.
   QuicErrorCode ProcessPeerHello(const CryptoHandshakeMessage& peer_hello,
                                  HelloType hello_type,
@@ skipping 33 matching lines @@
 
   // Socket receive buffer in bytes.
   // TODO(ianswett): Deprecate once QUIC_VERSION_34 is deprecated.
   QuicFixedUint32 socket_receive_buffer_;
 
   // Whether to support multipath for this connection.
   QuicNegotiableUint32 multipath_enabled_;
 
   // Whether tell peer not to attempt connection migration.
   QuicFixedUint32 connection_migration_disabled_;
+
+  // An alternate server address the client could connect to.
+  QuicFixedIPEndPoint alternate_server_address_;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CONFIG_H_